convert excel workbook into standalone software

I have an excel workbook containing various calculations across multiple sheets. I would like to have this workbook packaged as standalone software. I will also need a small keygen app to create serial keys for this software.

By this I mean that the software will perform the same function, but without the need to have excel installed. This would be a standard windows software package, and include stadnard features, such as allowing the user to specify the installation directory, an option to remove software at a later date, the option for the user to type in their serial key.

I will send the user the serial key when they purchase this software. I will use the keygen to create the serail key and then send this to the user.

I currently have the workbook (contins 3 worksheets) and a text document. This text document will be the help file. The user should be able to move between worksheets an the same way as they could normally. There should also be an option to save data (as a text file) which they can re-open at a later date.

Preference will be given to those who can provide a demo. For example, create a small spreadsheet, and then create an app to show the same functionality of the spreadsheet.